/// <summary>
/// Reads an IcmpPacket from the wire using the specified socket from the specified end point
/// </summary>
/// <param name="socket">The socket to read</param>
/// <param name="packet">The packet read</param>
/// <param name="ep">The end point read from</param>
/// <returns></returns>
public virtual bool Read(Socket socket, EndPoint ep, int timeout, out IcmpPacket packet, out int bytesReceived)
{
const int MAX_PATH = 256;
packet = null;
bytesReceived = 0;
/*
* check the parameters
* */
if (socket == null)
throw new ArgumentNullException("socket");
if (socket == null)
throw new ArgumentNullException("ep");
// see if any data is readable on the socket
bool success = socket.Poll(timeout * 1000, SelectMode.SelectRead);
// if there is data waiting to be read
if (success)
{
// prepare to receive data
byte[] bytes = new byte[MAX_PATH];
bytesReceived = socket.ReceiveFrom(bytes, bytes.Length, SocketFlags.None, ref ep);
/*
* convert the bytes to an icmp packet
* */
// packet = IcmpPacket.FromBytes(bytes);
}
return success;
}
/// <summary>
/// Writes the IcmpPacket to the wire over the specified socket to the specified end point
/// </summary>
/// <param name="socket">The socket to write to</param>
/// <param name="packet">The packet to write</param>
/// <param name="ep">The end point to write to</param>
/// <returns></returns>
public virtual int Write(Socket socket, IcmpPacket packet, EndPoint ep)
{
/*
* check the parameters
* */
if (socket == null)
{
throw new ArgumentNullException("socket");
}
if (socket == null)
{
throw new ArgumentNullException("packet");
}
if (socket == null)
{
throw new ArgumentNullException("ep");
}
// convert the packet to a byte array
byte[] bytes = IcmpPacket.GetBytes(packet);
// send the data using the specified socket, returning the number of bytes sent
int bytesSent = socket.SendTo(bytes, bytes.Length, SocketFlags.None, ep);
/*
* validate bytes sent
* */
return(bytesSent);
}
/// <summary>
/// Writes the IcmpPacket to the wire over the specified socket to the specified end point
/// </summary>
/// <param name="socket">The socket to write to</param>
/// <param name="packet">The packet to write</param>
/// <param name="ep">The end point to write to</param>
/// <returns></returns>
public virtual int Write(Socket socket, IcmpPacket packet, EndPoint ep)
{
/*
* check the parameters
* */
if (socket == null)
throw new ArgumentNullException("socket");
if (socket == null)
throw new ArgumentNullException("packet");
if (socket == null)
throw new ArgumentNullException("ep");
// convert the packet to a byte array
byte[] bytes = IcmpPacket.GetBytes(packet);
// send the data using the specified socket, returning the number of bytes sent
int bytesSent = socket.SendTo(bytes, bytes.Length, SocketFlags.None, ep);
/*
* validate bytes sent
* */
return bytesSent;
}
/// <summary>
/// Returns an IcmpPacket from an array of bytes
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
public static IcmpPacket FromBytes(byte[] bytes)
{
Debug.Assert(bytes != null);
IcmpPacket packet = new IcmpPacket();
packet.Type = bytes[0];
packet.Code = bytes[1];
packet.Checksum = BitConverter.ToUInt16(bytes, 2);
packet.Identifier = BitConverter.ToUInt16(bytes, 4);
packet.SequenceNumber = BitConverter.ToUInt16(bytes, 6);
packet.Payload = new byte[bytes.Length - (bytes.Length - 8)];
Array.Copy(bytes, 8, packet.Payload, bytes.Length - 8, packet.Payload.Length);
return(packet);
}
/// <summary>
/// Returns an array of bytes from an IcmpPacket
/// </summary>
/// <returns></returns>
public static byte[] GetBytes(IcmpPacket packet)
{
Debug.Assert(packet != null);
int index = 0;
byte[] bytes = new byte[packet.Payload.Length + 8];
byte[] typeBytes = new byte[] { packet.Type };
byte[] codeBytes = new byte[] { packet.Code };
byte[] checksumBytes = BitConverter.GetBytes(packet.Checksum);
byte[] idBytes = BitConverter.GetBytes(packet.Identifier);
byte[] sequenceBytes = BitConverter.GetBytes(packet.SequenceNumber);
// type
Array.Copy(typeBytes, 0, bytes, index, typeBytes.Length);
index += typeBytes.Length;
// code
Array.Copy(codeBytes, 0, bytes, index, codeBytes.Length);
index += codeBytes.Length;
// checksum
Array.Copy(checksumBytes, 0, bytes, index, checksumBytes.Length);
index += checksumBytes.Length;
// identifier
Array.Copy(idBytes, 0, bytes, index, idBytes.Length);
index += idBytes.Length;
// sequence number
Array.Copy(sequenceBytes, 0, bytes, index, sequenceBytes.Length);
index += sequenceBytes.Length;
// payload
Array.Copy(packet.Payload, 0, bytes, index, packet.Payload.Length);
index += packet.Payload.Length;
return(bytes);
}
/// <summary>
/// Reads an IcmpPacket from the wire using the specified socket from the specified end point
/// </summary>
/// <param name="socket">The socket to read</param>
/// <param name="packet">The packet read</param>
/// <param name="ep">The end point read from</param>
/// <returns></returns>
public virtual bool Read(Socket socket, EndPoint ep, int timeout, out IcmpPacket packet, out int bytesReceived)
{
const int MAX_PATH = 256;
packet = null;
bytesReceived = 0;
/*
* check the parameters
* */
if (socket == null)
{
throw new ArgumentNullException("socket");
}
if (socket == null)
{
throw new ArgumentNullException("ep");
}
// see if any data is readable on the socket
bool success = socket.Poll(timeout * 1000, SelectMode.SelectRead);
// if there is data waiting to be read
if (success)
{
// prepare to receive data
byte[] bytes = new byte[MAX_PATH];
bytesReceived = socket.ReceiveFrom(bytes, bytes.Length, SocketFlags.None, ref ep);
/*
* convert the bytes to an icmp packet
* */
// packet = IcmpPacket.FromBytes(bytes);
}
return(success);
}
/// <summary>
/// Returns an array of bytes from an IcmpPacket
/// </summary>
/// <returns></returns>
public static byte[] GetBytes(IcmpPacket packet)
{
Debug.Assert(packet != null);
int index = 0;
byte[] bytes = new byte[packet.Payload.Length + 8];
byte[] typeBytes = new byte[] {packet.Type};
byte[] codeBytes = new byte[] {packet.Code};
byte[] checksumBytes = BitConverter.GetBytes(packet.Checksum);
byte[] idBytes = BitConverter.GetBytes(packet.Identifier);
byte[] sequenceBytes = BitConverter.GetBytes(packet.SequenceNumber);
// type
Array.Copy(typeBytes, 0, bytes, index, typeBytes.Length);
index += typeBytes.Length;
// code
Array.Copy(codeBytes, 0, bytes, index, codeBytes.Length);
index += codeBytes.Length;
// checksum
Array.Copy(checksumBytes, 0, bytes, index, checksumBytes.Length);
index += checksumBytes.Length;
// identifier
Array.Copy(idBytes, 0, bytes, index, idBytes.Length);
index += idBytes.Length;
// sequence number
Array.Copy(sequenceBytes, 0, bytes, index, sequenceBytes.Length);
index += sequenceBytes.Length;
// payload
Array.Copy(packet.Payload, 0, bytes, index, packet.Payload.Length);
index += packet.Payload.Length;
return bytes;
}
/// <summary>
/// Returns an IcmpPacket from an array of bytes
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
public static IcmpPacket FromBytes(byte[] bytes)
{
Debug.Assert(bytes != null);
IcmpPacket packet = new IcmpPacket();
packet.Type = bytes[0];
packet.Code = bytes[1];
packet.Checksum = BitConverter.ToUInt16(bytes, 2);
packet.Identifier = BitConverter.ToUInt16(bytes, 4);
packet.SequenceNumber = BitConverter.ToUInt16(bytes, 6);
packet.Payload = new byte[bytes.Length - (bytes.Length - 8)];
Array.Copy(bytes, 8, packet.Payload, bytes.Length - 8, packet.Payload.Length);
return packet;
}
private void OnThreadRun(object sender, BackgroundThreadStartEventArgs e)
{
// const int SOCKET_ERROR = -1;
try
{
string address = (string)e.Args[0];
int timesToPing = (int)e.Args[1];
#region Address Resolution
bool isHostName = false;
IPAddress ipAddress = null;
try
{
ipAddress = IPAddress.Parse(address);
}
catch (Exception)
{
try
{
ipAddress = Dns.GetHostEntry(address).AddressList[0];
isHostName = true;
}
catch (Exception ex)
{
throw ex;
}
}
#endregion
// create the source and destination end points
IPEndPoint sourceIPEP = new IPEndPoint(IPAddress.Any, 0);
IPEndPoint destinationIPEP = new IPEndPoint(ipAddress, 0);
EndPoint source = sourceIPEP;
EndPoint destination = destinationIPEP;
// create an icmp socket
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
// create an icmp echo packet
IcmpEchoPacket packet = new IcmpEchoPacket();
// serialize the packet to a byte array
byte[] bytes = IcmpPacket.GetBytes(packet);
// create the checksum for the packet based on it's data
packet.Checksum = IcmpPacket.CreateChecksum(bytes);
// create a packet reader and writer
IcmpPacketReader reader = new IcmpPacketReader();
IcmpPacketWriter writer = new IcmpPacketWriter();
// raise the ping started event
this.OnPingStarted(this, new PingerEventArgs(address, isHostName, ipAddress, timesToPing));
// ping statistics
int packetsSent = 0;
int packetsReceived = 0;
int[] elapsedTimes = new int[timesToPing];
// now ping the destination X number of times as instructed
for (int i = 0; i < timesToPing; i++)
{
int start = System.Environment.TickCount;
int end = 0;
int elapsed = 0;
try
{
// send the icmp echo request
int bytesSent = writer.Write(socket, packet, destination);
packetsSent++;
// wait for a response
IcmpPacket response;
int bytesReceived;
bool receivedResponse = reader.Read(socket, source, 1000 /* 1 second timeout */, out response, out bytesReceived);
// calculate the end and elapsed time in milliseconds
end = System.Environment.TickCount;
elapsed = end - start;
elapsedTimes[i] = elapsed;
if (receivedResponse)
{
packetsReceived++;
}
// raise the ping result event
this.OnPingResult(this, new PingerResultEventArgs(address, isHostName, ipAddress, timesToPing, !receivedResponse, bytesReceived, elapsed));
}
catch (Exception ex)
{
/*
* this should never hit
*
* raw sockets shouldn't pose a problem when targeting icmp
* */
this.OnException(this, new ExceptionEventArgs(ex));
}
}
// calculate the percentage lost
int percentLost = (int)(((double)(packetsSent - packetsReceived) / (double)packetsSent) * 100d);
int min = int.MaxValue;
int max = int.MinValue;
int average = 0;
int total = 0;
for (int i = 0; i < timesToPing; i++)
{
if (elapsedTimes[i] < min)
{
min = elapsedTimes[i];
}
if (elapsedTimes[i] > max)
{
max = elapsedTimes[i];
}
total += elapsedTimes[i];
}
average = (int)((double)total / (double)timesToPing);
PingerStatisticsEventArgs ea = new PingerStatisticsEventArgs(
address, isHostName, ipAddress, timesToPing,
packetsSent,
packetsReceived,
packetsSent - packetsReceived,
percentLost,
min,
max,
average);
this.OnPingStatistics(this, ea);
}
catch (ThreadAbortException)
{
}
catch (Exception ex)
{
Debug.WriteLine(ex);
this.OnException(this, new ExceptionEventArgs(ex));
}
finally
{
}
}
